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| unalloyed quality steel; high quality unalloyed steel (【技】除普通质量非合金钢和特殊质量非合金钢以外的非合金钢。这种钢在生产过程中需要特别控制晶粒度，降低硫、磷含量，改善表面质量，增加工艺控制。) | |||
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